DOI: 10.1016/j.palaeo.2015.08.034
论文题名: Calcified rivulariaceans from the Ordovician of the Tarim Basin, Northwest China, Phanerozoic lagoonal examples, and possible controlling factors
作者: Liu L. ; Wu Y. ; Hongxia J. ; Riding R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 448 起始页码: 371
结束页码: 381
语种: 英语
英文关键词: Calcified cyanobacteria
; Lagoon
; N2-fixation
; Phanerozoic
; Phosphate
; Rivulariaceae
英文摘要: A distinctive association of rivulariacean-like calcified microfossils is recognized in back-reef lagoon facies on the Bachu-Tazhong Platform in the Lianglitag Formation (Katian Stage, Upper Ordovician) of the Tarim Basin, based on investigation of 4500 thin sections from 35 well drill cores. The genera include Hedstroemia, Ortonella, Zonotrichites, Cayeuxia, and Garwoodia, most of which have features comparable with present-day calcified cyanobacteria such as Rivularia, Calothrix and Dichothrix (Rivulariaceae, Nostocales). A similar association is present in lagoonal and other restricted nearshore shallow-marine carbonate environments during much of the Paleozoic and Mesozoic. This suggests the sustained presence of a rivulariacean-dominated cyanobacterial association characteristic of back-reef/lagoonal environments. At the present-day, uncalcified Rivularia, Calothrix and Dichothrix remain common in back-reef, lagoon, mangrove-swamp, rocky shore, salt-marsh, and saline lake environments. The ability of these cyanobacteria to grow in environments low in inorganic nitrate and phosphate could help to explain this distribution. Cenozoic decline in marine calcified rivulariaceans is attributed to global reduction of seawater carbonate saturation state. The Phanerozoic record of calcified rivulariacean cyanobacteria appears to sensitively reflect long-term variations in the carbonate and nutrient chemistry of marine environments. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68511
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, United States
Recommended Citation:
Liu L.,Wu Y.,Hongxia J.,et al. Calcified rivulariaceans from the Ordovician of the Tarim Basin, Northwest China, Phanerozoic lagoonal examples, and possible controlling factors[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,448